Enter the message that you want to display when the cell or cell range is selected in the sheet.
Choose Data - Validity - Input Help tab.
Displays the message that you enter in the Contents box when the cell or cell range is selected in the sheet.
If you enter text in the Contents box of this dialogue box, and then mark and unmark this check box, the text will be lost.
Enter the title that you want to display when the cell or cell range is selected.
Enter the message that you want to display when the cell or cell range is selected.